Applying spent lithium iron phosphate battery as raw material,valuable metals in spent lithium ion battery were effectively recovered through separation of active material,selective leaching,and stepwise chemical prec...Applying spent lithium iron phosphate battery as raw material,valuable metals in spent lithium ion battery were effectively recovered through separation of active material,selective leaching,and stepwise chemical precipitation.Using stoichiometric Na2S2O8 as an oxidant and adding low-concentration H2SO4 as a leaching agent was proposed.This route was totally different from the conventional methods of dissolving all of the elements into solution by using excess mineral acid.When experiments were done under optimal conditions(Na2S2O8-to-Li molar ratio 0.45,0.30 mol/L H2SO4,60℃,1.5 h),leaching efficiencies of 97.53% for Li^+,1.39%for Fe^3+,and 2.58% for PO4^3−were recorded.FePO4 was then recovered by a precipitation method from the leachate while maintaining the pH at 2.0.The mother liquor was concentrated and maintained at a temperature of approximately 100℃,and then a saturated sodium carbonate solution was added to precipitate Li2CO3.The lithium recovery yield was close to 80%.展开更多
为了挖掘终端区进场航空器交通流的分布特征,量化分析空中交通的复杂性,提出了一种基于多特征航迹相似度和密度峰值聚类(density-peak clustering,DPC)的中心航迹提取方法。首先,采用单向距离(one way distance,OWD)计算航迹之间的形状...为了挖掘终端区进场航空器交通流的分布特征,量化分析空中交通的复杂性,提出了一种基于多特征航迹相似度和密度峰值聚类(density-peak clustering,DPC)的中心航迹提取方法。首先,采用单向距离(one way distance,OWD)计算航迹之间的形状和物理距离,并结合空管实际运行航迹数据特征,考虑航迹之间的位置属性和航向属性,定义多特征航迹相似度模型。其次,使用密度峰值聚类算法对航迹数据进行聚类分析,提取聚类结果中每一簇中具有最高密度的真实轨迹作为中心航迹。最后,对双流国际机场终端区历史航迹数据进行实验分析,使用轮廓系数指标和基于密度的指标进行评价,并与层次聚类算法进行对比。结果表明,轨迹被划分为8个不同形态的类簇,该方法可以直观有效的识别出轨迹的整体运动特征并精确提取出真实的中心航迹。展开更多
Objective:To investigate the expression of serum transforming growth factorβ2(TGF-β2)and galectin-2(Galectin-2)in patients with atrial fibrillation and its clinical significance.Methods:A total of 150 inpatients in ...Objective:To investigate the expression of serum transforming growth factorβ2(TGF-β2)and galectin-2(Galectin-2)in patients with atrial fibrillation and its clinical significance.Methods:A total of 150 inpatients in the Department of Cardiology of the First Affiliated Hospital of Bengbu Medical College from January 2019 to June 2019 were selected,including 84 patients in the paroxysmal atrial fibrillation group,66 patients in the persistent atrial fibrillation group,and 120 patients with sinus rhythm excluding atrial fibrillation who were hospitalized during the same period were selected as the control group.Blood routine,biochemical routine and cardiac ultrasonic morphological examination were improved after admission.In addition,the serum levels of TGF-β2 and Galectin-2 in each group were detected by Elisa and Western Blot,and the differences and clinical significance of TGF-β2 and Galectin-2 in different groups were statistically analyzed.The correlation between TGF-β2,Galectin-2 and left atrial end-diastolic diameter(LAD)was further determined by Pearson correlation analysis.By means of binary logistics regression analysis,the factors affecting atrial fibrillation were obtained.Results:Compared with the control group,age and LAD in atrial fibrillation group were significantly increased(P<0.05).The serum concentrations of TGF-β2 and galectin-2 in persistent af group were significantly increased compared with those in paroxysmal af group and control group(P<0.05),while those in control group were significantly decreased compared with paroxysmal AF group(P<0.05).Pearson correlation analysis showed that TGF-β2 and Galectin-2 concentrations were significantly positively correlated with LAD size in the experimental group(P<0.05).Binary logistic regression analysis showed that TGF-β2,galectin-2 and LAD were risk factors for atrial fibrillation(P<0.05).Conclusion:TGF-β2 and Galectin-2 are closely related to the occurrence and development of atrial fibrillation.Both TGF-β2 and Galectin-2 were positively correlated with LAD.The three have a synergistic effect on the occurrence and progression of atrial inflammatory fibrosis in patients with ATRIAL fibrillation,jointly promoting mechanical and electrical remodeling of atrial,and can be used as risk factors to evaluate the occurrence and progression of atrial fibrillation.展开更多
基金Project(Z20160605230001)supported by Hunan Province Non-ferrous Fund Project,China。
文摘Applying spent lithium iron phosphate battery as raw material,valuable metals in spent lithium ion battery were effectively recovered through separation of active material,selective leaching,and stepwise chemical precipitation.Using stoichiometric Na2S2O8 as an oxidant and adding low-concentration H2SO4 as a leaching agent was proposed.This route was totally different from the conventional methods of dissolving all of the elements into solution by using excess mineral acid.When experiments were done under optimal conditions(Na2S2O8-to-Li molar ratio 0.45,0.30 mol/L H2SO4,60℃,1.5 h),leaching efficiencies of 97.53% for Li^+,1.39%for Fe^3+,and 2.58% for PO4^3−were recorded.FePO4 was then recovered by a precipitation method from the leachate while maintaining the pH at 2.0.The mother liquor was concentrated and maintained at a temperature of approximately 100℃,and then a saturated sodium carbonate solution was added to precipitate Li2CO3.The lithium recovery yield was close to 80%.
文摘为了挖掘终端区进场航空器交通流的分布特征,量化分析空中交通的复杂性,提出了一种基于多特征航迹相似度和密度峰值聚类(density-peak clustering,DPC)的中心航迹提取方法。首先,采用单向距离(one way distance,OWD)计算航迹之间的形状和物理距离,并结合空管实际运行航迹数据特征,考虑航迹之间的位置属性和航向属性,定义多特征航迹相似度模型。其次,使用密度峰值聚类算法对航迹数据进行聚类分析,提取聚类结果中每一簇中具有最高密度的真实轨迹作为中心航迹。最后,对双流国际机场终端区历史航迹数据进行实验分析,使用轮廓系数指标和基于密度的指标进行评价,并与层次聚类算法进行对比。结果表明,轨迹被划分为8个不同形态的类簇,该方法可以直观有效的识别出轨迹的整体运动特征并精确提取出真实的中心航迹。
基金General Fund of National Natural Science Foundation of China(No.81970313)Anhui Province Science and Technology Research Related(1804h08020246)Postgraduate Research Innovation Program of Bengbu Medical College in 2020(No.Byycx20080)。
文摘Objective:To investigate the expression of serum transforming growth factorβ2(TGF-β2)and galectin-2(Galectin-2)in patients with atrial fibrillation and its clinical significance.Methods:A total of 150 inpatients in the Department of Cardiology of the First Affiliated Hospital of Bengbu Medical College from January 2019 to June 2019 were selected,including 84 patients in the paroxysmal atrial fibrillation group,66 patients in the persistent atrial fibrillation group,and 120 patients with sinus rhythm excluding atrial fibrillation who were hospitalized during the same period were selected as the control group.Blood routine,biochemical routine and cardiac ultrasonic morphological examination were improved after admission.In addition,the serum levels of TGF-β2 and Galectin-2 in each group were detected by Elisa and Western Blot,and the differences and clinical significance of TGF-β2 and Galectin-2 in different groups were statistically analyzed.The correlation between TGF-β2,Galectin-2 and left atrial end-diastolic diameter(LAD)was further determined by Pearson correlation analysis.By means of binary logistics regression analysis,the factors affecting atrial fibrillation were obtained.Results:Compared with the control group,age and LAD in atrial fibrillation group were significantly increased(P<0.05).The serum concentrations of TGF-β2 and galectin-2 in persistent af group were significantly increased compared with those in paroxysmal af group and control group(P<0.05),while those in control group were significantly decreased compared with paroxysmal AF group(P<0.05).Pearson correlation analysis showed that TGF-β2 and Galectin-2 concentrations were significantly positively correlated with LAD size in the experimental group(P<0.05).Binary logistic regression analysis showed that TGF-β2,galectin-2 and LAD were risk factors for atrial fibrillation(P<0.05).Conclusion:TGF-β2 and Galectin-2 are closely related to the occurrence and development of atrial fibrillation.Both TGF-β2 and Galectin-2 were positively correlated with LAD.The three have a synergistic effect on the occurrence and progression of atrial inflammatory fibrosis in patients with ATRIAL fibrillation,jointly promoting mechanical and electrical remodeling of atrial,and can be used as risk factors to evaluate the occurrence and progression of atrial fibrillation.
